Pump construction



v 7 Aug. 3, 1948.- b. SAMIRAN 9 5 4 PUMP CONSTRUCTION Filed July 30,1943 2 Sheets-Shut l I f Q g 1948- 1 D. sAMlRAN 2,445,194

' ruur cous'muc'non Filed July 30, 1943 I 2 Sheets-Sheet 2 04400 4 SAM/94 raAuve y;-

Patented A 1-948 w UNITED STATES PATENT OFFICE; 2,440,194

' rum cons'muc'rron David Samiran, mm, om Application July so, 1943,Serial No. 498.898 Claims. (01.103-126) I (Granted under the act ofMarch 3, 1883, u

The invention described herein may be menu-- factured and used by or forthe Government for metric output of the pump with a minimum degree offriction between the rotary parts of the pump and the pump casing.

A further object is the provision of capillary fluid collection sealingmeans for rotary impeller pumps, formed in the inner surface of the pumpcasing so that the impeller or rotor means may be disposed to move injuxtaposed closely spaced relation to the inner surface of the pumphousing without frictional contact between the rotor and interior of thecasing, the sealing means reducing the fluid leakage between the rotorand the inlet and outlet sides of the pump, thus effecting ease ofoperation, efficiency in the fluid delivery outputof the pump, andeconomy in the manufacture, since the inner wall of the casing andperipheral portions of the impeller means are out of actual contact, aminimum amount of machining operations only are necessary in themanufacture or the assembly of the pump.

Other objects and advantages of the invention will be apparent, as setforth in the following description, taken in connection-with theaccompanying drawings, in which like reference characters refer to likeparts in the several flgures.

Fig. 1 is a vertical sectional view taken through a rotary impellertype-fluid delivery pump having my improved labyrinth fluid sealingmeans incorporated therein, certain of the parts being shown inelevation.

Fig. 2 is a cross sectional view through'the pump shown in Fig. 1,certain of the parts thereof being shown more or less in elevation.

In the drawingsthe numeral I indicates a pump casing or housing, as bestseen in Fig. 1, having spaced semicylindrical side walls 2 and 8, andparallel end walls 4 and 5, the end wall I comprising one face of theremovable closure or cover plate Gfiwhich is secured to the housingproper by suitable fastening means, such as cap screws 1. y W

Referring now to Fig. 2, the housing is provided with substantiallyaligned fluid inlet and outlet ports 8 and 9, opening into the casingbeamended April 80, 1928; 370 O. G. 157) tween the ends of thesemioylindrical side walls 2 and I, and inlet and outlet screens Ill andH are disposed across the aforementioned ports to prevent the passage offoreign matter through the pump. 1 A flanged fluid supply nipple or hoseconnection I! is secured across the inlet port, and a threaded outletflange II is similarly secured across the outlet port by suitablefastening means, as indicated at ll.

Supporting feet. or standards l5, are formed on the base of the pumphcusing, which may be suitably recessed and threaded to secure thepunzlp in a suitable fixed position for use as desire Thesemicylindrical inner side walls 2 and 3 have their central axes atvertically spaced points, as indicated at It and fl, and the innerarcuate surfaces of the semicylindrical walls are provided with aplurality of equally spaced, substantially parallel capillary fluidcollection sealing grooves i8, terminating just short of the oppositeend walls 4 and I. These end walls I and 5 are also provided with aplurality of capillary fluid collection sealing grooves i9, extendingradially from the axial centers l6 and H, in

alignment with the parallel grooves IIB afore- 7 sockets, which alsohave their centers concentric to the axes I6 and IL Suitable grease gunflttings of'the Zerk" type are provided for introducing lubricant intothe last mentioned re-- cesses.

A vent opening 25' is formed in the end wall 4,

adJacent the outer port 8 to permit the passage of fluid through thiswall into the gear casing,

7 later to be described. 4

'Interengaging impeller members, indicated generally at 26 and 21, areprovided, as seen in the drawings, these impellers being constructed insubstantially the same manner, with the exception of the driving geararrangement, and the same reference numerals are therefore applied tomost of the detail constituent parts of both impellers. videdwith stubaxle shafts 28 and 29, extending from the ends thereof,'on which aremounted Each of the impellers is proto the integral side wall :operatinghandle project the stub axle shafts 28 and 28. Each barrel has securedto the opposite sides thereof, in diametrically opposite relation,,apair of T-rshaped impeller heads or blades 34, having arcuate peripheralsurfaces 35 arranged to move in closely spaced juxtaposed relation tothe interior semicylindrical side wall surfaces 2 and 3 of the housingI. These head members 34 are secured in place on the cylindrical barrels32 and 33 by pins or rivets 36, and the headed ends 31 ofthe rivets aresecured in flush relation with respect to the arcuate peripheralsurfaces 35 of the said heads or blades 34.

Each of the cylindrical barrels 3'2 and 33 is provided with alongitudinally extending eccentrically mounted grease delivery tube 38extending from a point adjacent the antifriction bearfriction bearing3|, so that grease forced under pressure through the fittings 24 may bedelivered to both sets of antifriction bearing members. The upper stubaxle shaft 29, as seen in Fig. 1, extends through and beyond the endwall 4, and carries fixed thereon a large drive gear 39, and a similarlyfixed smaller driving gear 40. The

a second. large gear 4|, meshingwith the aforementioned gear 39, andidentical in size to the last mentioned gear.

The two rotors 28 and 21 are disposed with their impeller blades orheads 34 in a 90 out-of-phase relation so. that the arcuate surface 35of one of the blades will always be in alternately light wiping contactwith the cylindrical surface of one of the barrels 32 or 33 of theopposite impeller member, and the two large gears 39 and 4| maintainthis relatively fixed out-of-phase interengaging pumping relationbetween the two impellers.

It will be noted that as the peripheral surfaces 33 rotate past thegrooves l8, and as the head members 34 rotate past the grooves It, theentire length of the capillarygrooves l8 and I9 come again in contactwith the fluid being pumped, and that the entire length of eachcapillary groove is completely filled immediately prior to the passingof the rotors. f

A cover plate or bell-shaped gear housing closure 42 is suitablysecured, as indicated at 43, portion 4' of the pump housing, and thisclosure is provided with an inral sleeve extension 44, through whichextends the drive shaft 45, mounted on the needle or roller bearings 46and 41, carried in the sleeve extension. Grease gun fittings 48 areprovided to supply lubricant to the needle bearings, and a suitablepacking gland member 49 is interposed between the bearings 46 and 41 toprevent leakage from the casing of the fiuidbeing pumped. The end of thedrive shaft 45 extending into the bellshaped gear housing to a pointadjacent the lower large gear H has fixed thereon a large driving gear50 meshing with the small driven gear 40 on the upper impeller stub axleshaft 29. An I is secured to the end of the drive shaft 45, projectingthrough the sleeve extension 44 to the exterior thereof.

' Byutilizing the capillary. fluid sealing grooves in the arcuate sideand parallel end walls of the housing, I provide an effective fluidcollection labyrinth seal between the inlet and outlet ports and 22 and2t and 23,

4 Q I so that the impellers 26 and 21 may be constructed with a freerunning fit with respect to the end and semicylindrical side walls ofthe housing, with a relativeclearance therebetween of as much as athousandth of an inch. This makes it possible to reduce the degree ofprecision machining of parts which is necessary where the parts are inthe in; to a point adjacent the face of the antiet al., which disclosesa rotary impeller pump of lower stub axle shaft 29 also has fixedthereon usual actual wiping contact, and the labyrinth fluid sealingstructure reduces leakage between the inlet and outlet ports past theimpellers to a minimum, thus providing a pump structure that isextremely efiicient in its volumetric output, and operable with aminimum degree of friction and effort. The pump is entirely enclosed andsubstantially frictionless with the exception of the slight Wipingcontact between the arcuate surfaces of the rotors, and the friction ofthe packing or sealing gland 49 on the drive shaft 45. While I havedescribed the pump as operating with definitely located inlet and outletports, it is obvious that the pump is fully reversible by merely turningthe crank handle in the opposite'direction.

For the actual operation of the impellers of the pump, reference may behad to Patent 2,262,231,

issued on November 11, 1941 to F. W. Guibert,

somewhat conventional form, having impeller heads or blades similar ingeneral shape to that disclosed in my improved pump. In this patent, theperiphery and ends of the impeller blades are arranged to move in wipingcontact with the end and Side walls of the pump housing, requiringprecision machining of parts in order to reduce leakage, and therelative friction between these parts is suflicient to make a pump ofthis type, without my improved construction incorporated therein, verydiificult to operate, which soon causes inefliciency in fluid deliveryoutput as the parts become worn, due to this friction.

Having thus described a specific embodiment of my invention forillustrative purposes, what I claim as new, and desire to. secure byLetters Patent, is:

1. In a rotary fluid pump pumps of the class described, a closed casinghaving parallel end walls and a pair of spaced semicylindrical sidewalls facing each other with substantially aligned inlet and outletports formed in the casing intermediate the adjacent ends of the curvedsurfaces of the semicylindrical walls, said semicylindrical walls havinga, plurality of spaced substantially parallel capillary fluid collectiongrooves formed therein extending without interruption in their lengthsubstantially longitudinally to the axes of the semicylindrical walls topoints adjacent to and spaced from each of the parallel end walls of thecasing.

2. A rotary fluid pump casing for pumps of the class described,comprising a closed casing having parallel end walls and a pair ofspaced semicylindrical side walls facing each other with substantiallyaligned inlet and outlet ports formed in the casing intermediate theadjacent ends of the curved surfaces of the semicylindrical walls, saidsemicylindrical walls having a plurality of spaced substantiallyparallel capillary fluid collection casing for impeller ward theparallel fluid collection grooves formed in the semicylindrical sidewalls of the casing and terminating at points adjacentto and spacedradially inwardly from each of the semicylindrical side walls to leaveadjacent unobstructed end and side wall portions at the juncture betweenthe semicylindrical side walls and each of the parallel end walls,extending between the adjacent inlet and outlet ends of the casing.

3. In a rotary fluid pump of the class described, a closed casing havingparallel end walls and a -pair' of spaced semicylindrical side wallsfacing 'ing a plurality of substantially parallel capillary continuousintermediate wall comprising a pair of spaced semicylindrical side wallsfacing each other with intermediate connecting walls havingsubstantially aligned inlet and outlet ports formed therein intermediatethe adjacent ends of the curved surfaces of the semicylindrical walls,said semicylindrical walls having a plurality of substantially parallelcapillary fluid collection liquid sealing grooves formed therein betweenthe ends thereof extending substantially parallel to the axes of thesemicylindrical walls, each groove terminating at its ends adjacent theadjoining parallel end walls of the casing in spaced relation thereto,said parallel end walls having a plurality of capillary fluid collectiongrooves formed therein and extending substantially radially outward fromthe axial center of the semicylindrical walls of the casing in radialplanesp'assing through the capillary grooves formed in the innersemicylindrical surfaces of the casing and terminating in radiallyinwardly spaced relation to the first mentioned grooves, andinterengaging rotary impeller pumping means within the casing operablein closely spaced relation to said side and end walls past saidcapillary fluid collecting grooves and the ungrooved portions of theside and end walls intermediate the adjacent ends of the grooves in theend and side walls. a

4. In a rotary fluid pump casing for pumps of the class described, aclosed casing having parallel end walls and a pair of spacedsemicylindrical side walls facing each other with substantially alignedinlet and outlet ports formed in the casing intermediate the adjacentends of the curved surfaces of the semicylindrical walls, saidsemicylindrical walls each having a plurality of substantially parallelcapillary fluid collection liquid sealing grooves formed thereinextending substantially equally spaced around the walls between the endsthereof parallel to the axes thereof to points adjacent to and spacedfrom the adjoining parallel end walls of the casing, said parallel endwalls having a plurality of capillary fluid collection grooves formedtherein and extending substantially radially outward from the axialcenter of the semicylindrical walls of'th'e casing in radial planespassing through the capillary sealing grooves formed in the innersemicylindrical surfaces of the casing, said longitudinal and radialsealing grooves having their adjacent ends terminating opposite eachother in spaced relation to,

leave the adjoining side and end wall portions of the casinguninterrupted.

5. In a rotary fluid pump of the class described, a closed casing havingparallel end walls and a fluid collection liquid sealing grooves formedtherein extending substantially longitudinally of the semicylindricalwalls parallel to the semicylindrical walls to points spaced from andadjacent to the adjoining parallel end walls of the casing, saidparallel end walls having a plurality of capillary fluid collectiongrooves: formed therein and extending substantially radially outwardfrom the axial center of the semicylindrical walls of the casing inplanes passing through the capillary grooves formed in the innersemicylindrical surfaces or the casing. terminating adjacent to andradially inwardly of the semicylindrical side walls, and interengagingrotor impeller fluid pumping means parallel end walls with their axesconcentric to the radial centers of the semicylindrical walls of thecasing and having spaced substantially similar arcuate surfaces arrangedto move past the aforesaid substantially parallel capillary fluidcollection liquid sealing grooves in closely spaced relation to thesemicylindrical walls aforesaid, between the inlet and outlet ports inthe casing, said interengaging rotary impeller fluid pumping meanshaving parallel end surfaces adjoining the arcuate surfaces thereof anddisposed to move past the substantially radially disposed capillaryfluid collection grooves'in the parallel end walls of the casing inclosely spaced fluid sealing relation thereto. with the edges of theimpellers at the juncture between the arcuate surfaces and the adjacentparallelend walls disposed to move in closely spaced relation past theadjacent ungrooved portions of the casing located between the adjacentends of the parallel fluid collection liquid sealing grooves and theouter ends of the radially disposed capillary fluid collection grooves.

DAVID SAMIRAN rtsrnnnncns crrnn file of this patent:

' UNITED STATES PATENTS journaled in the casing in said

